Concluding Remarks

In the present chapter, the method of static and dynamic balancing of rotors has been presented in detail. Basic concepts of the dynamic balancing both for the slow speed (i.e., rigid rotors) and for the high-speed (i.e., flexible rotors) is provided initially to have thorough understanding of basic concepts of balancing. The concepts of concentrated and distributed eccentricity has been described. Balancing of practical rigid rotors with the single-plane static method is explained. Two methods of dynamic balancing of rigid rotors are explained, namely, the cradle balancing machine method (which requires the vibration amplitude measurement) and the influence coefficients method (which requires the vibration amplitude and phase measurement). The basic concepts of the modal balancing and influence coefficients balancing methods are explained. For balancing of flexible practical rotors by these methods detailed procedures are outlined. Standards available for level of balancing for different class of rotors are briefed and the universal measuring parameters adopted in these standards for classifying various machinery is explained.